According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . Based on lattice energy and other consideration , which one of the following alkali metal chlorides is expected to have the highest melting point ?

According to Fajan rules , the percentage of covalent character in an

1.	According to Fajan rules , the percentage of covalent character in an ionic compound increases . If the cation is highly charged or the cation is small and the anion is large or the cation has pseudo inert gas configuration . As a result of increased covalent character , the melting point decreases and solubility in less polar solvent increases . Based on lattice energy and other consideration , which one of the following alkali metal chlorides is expected to have the highest melting point ?
Answer» LiCl NaCl KCl RbCl . SOLUTION :LiCl being COVALENT has the lowest MELTING point . Among the remaining chlorides , because of SMALLER size of Na , NaCl has the highest lattice energy and hence has the highest melting point .